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8421 xl building instructions - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
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BrickLink - Set 8421-1 : LEGO Mobile Crane [Technic:Model:Construction] - BrickLink Reference Catalog
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BrickLink - Instruction 8421-1 : LEGO Mobile Crane [Technic:Model:Construction] - BrickLink Reference Catalog
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